Urban environment alter the timing of progression of testicular recrudescence in tree sparrow (Passer montanus)

Renthlei, Zothanmawii; Borah, Bijoy Krishna; Trivedi, Amit Kumar

doi:10.1007/s11356-021-12918-6

Cited by 9 publications

(5 citation statements)

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“…This morphological alteration in neuron‐glial interaction seems to be involved in regulating seasonal GnRH secretion. A similar mechanism of seasonal reproduction has been studied in many tropical species (Dixit et al, 2020, 2022; Srivastava, Trivedi, Malik, Rani, & Kumar 2015; Mishra et al (2017a); Mishra et al (2017b); Renthlei et al, 2021a, 2021b).…”

Section: Regulation Of Seasonal Reproduction In Birds: General Patternsmentioning

confidence: 73%

“…TSH, thyroidstimulating hormone Mel1c receptors expressed in GnIH neurons, and melatonin increases the GnIH expression in short photoperiod as compared to long photoperiod (Ubuka et al, 2005). Later on, the role of GnIH in photoperiodic regulation of seasonal reproduction has also been demonstrated in many tropical species (Dixit et al, 2017;Renthlei et al, 2021aRenthlei et al, , 2021b.…”

Section: Regulation Of Seasonal Reproduction In Birds: General Patternsmentioning

confidence: 99%

“…In a study conducted on tropical tree sparrows, the seasonal responses were compared between urban and rural birds (Renthlei et al, 2021a). Birds were procured from two locations (urban and rural) for four-time of the year, i.e., March, June, September, and December (Renthlei et al, 2021b) and delay in testicular initiation was observed in urban birds (Renthlei et al, 2021a). In another study where the monthly change in body mass, bill color, gonads, and molt in body and primary flight feathers were recorded during the middle of each month for a year time from the birds procured from rural and urban locations, the body mass of male birds (Figure 3a) differed at two times of the year, i.e., during July and August (Figure 3a) where urban birds had significantly higher body mass (Renthlei, 2021).…”

Section: Urbanization and Seasonalitymentioning

confidence: 99%

Section: Urbanization and Seasonalitymentioning

confidence: 99%

“…GnRH secretion. A similar mechanism of seasonal reproduction has been studied in many tropical species(Dixit et al, 2020(Dixit et al, , 2022Srivastava, Trivedi, Malik, Rani, & Kumar 2015;Mishra et al (2017a);Mishra et al (2017b);Renthlei et al, 2021aRenthlei et al, , 2021b.…”

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confidence: 92%

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Seasonality in tropical birds

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The survival of offspring depends on environmental conditions. Many organisms have evolved with seasonality, characterized as initiation‐termination‐reinitiation of several physiological processes (i.e., body fattening, molt, plumage coloration, reproduction, etc). It is an adaptation for the survival of many species. Predominantly seasonal breeders use photoperiod as the most reliable environmental cue to adapt to seasonal changes but supplementary factors like temperature and food are synergistically involved in seasonal processes. Studies from diverse vertebrate systems have contributed to understanding the mechanism involved in seasonal reproduction at the molecular and endocrine levels. Long‐day induced thyrotropin (thyroid‐stimulating hormone) released from the pars tuberalis of the pituitary gland triggers local thyroid hormone activation within the mediobasal hypothalamus. This locally produced thyroid hormone, T3, regulates seasonal gonadotropin‐releasing hormone secretion. Most of the bird species studied are seasonal in reproduction and linked behavior and, therefore, need to adjust reproductive decisions to environmental fluctuations. Reproductive strategies of the temperate zone breeders are well‐documented, but less is known about tropical birds' reproduction and factors stimulating the annual breeding strategies. Here, we address seasonality in tropical birds with reference to seasonal reproduction and the various environmental factors influencing seasonal breeding.

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